NYSE Euronext (NYX) has raised concerns that U.S. capital markets could become less attractive to investors as countries including Australia and Canada press ahead with curbs on private stock dealing.

Stricter rules governing off-exchange stock trading venues such as so-called "dark pool" platforms will boost investing in other jurisdictions, while U.S. regulators have yet to take similar actions, said a senior NYSE executive.

The warning is the latest from U.S. exchange operators concerned about so-called "regulatory arbitrage," though most previous calls have sought to highlight more lax oversight overseas, rather than tougher rules.

One concern has been that the U.S. could lose ground if investors and companies find other countries friendlier places to trade and raise capital, though past warnings about U.S. curbs on commodity speculation driving business to Asia have yet to prove out.

NYSE has long argued in favor of tougher restrictions on private securities markets run by banks and big brokerages, where investors do business anonymously. They maintain such firms are more loosely regulated, allowing them to be more nimble in reacting to market changes by quickly tweaking functions of their platforms.

"Both the regulators in Canada and Australia seem to have concluded and agreed with some of the points we've been making about the effects off-exchange trading has on market quality," said Joseph Mecane, head of U.S. equities for NYSE.

Dark pool operators maintain that they provide investors with a necessary alternative to exchanges for big trades, often at better prices than can be found on the Big Board or the Nasdaq Stock Market.

In the U.S., more than 37% of all shares were traded on private markets so far this month, according to BATS Global Markets Inc., on pace to set an all-time record. Exchange executives argue that as the level of off-exchange activity rises, the prices broadcast by exchanges mean less, because there are fewer trades behind those prices.

Exchanges have been tussling with external operators for years in Washington DC. Securities regulators have granted exchanges some new capabilities to compete with banks while holding off on regulations that would have required dark pools to publicly disclose more of their activity.

Eric Noll, head of transaction services in the U.S. for Nasdaq OMX Group Inc. (NDAQ), said the company was monitoring the effects on Canadian and Australian markets, and supported a "broad review" of U.S. market regulation to improve trading for investors.

Canadian regulators in 2012 began requiring private stock-trading venues to provide better prices on share orders than are available on exchanges, as well as a minimum size for trades carried out privately.

Australia last year outlined plans curbing the number of small-size transactions done on private platforms, and on Monday its regulators proposed new rules requiring dark-pool operators to release more information on the types of trading offered and activity on their markets.

"The Australian regulators have done a pretty good job," said Peter Hiom, deputy chief executive of ASX Ltd. (ASX.AU), the country's main exchange operator, in a recent interview.

Officials at NYSE and Nasdaq OMX Group Inc. (NDAQ) have closely watched the developments overseas, and NYSE's Mr. Mecane said in an interview that curbs on dark trading will encourage institutions and individual traders to put more money into those stock markets.

A spokesman for the Securities and Exchange Commission said its staff had drawn no conclusions from its analysis of trading data so far.

It's too early to accurately gauge whether the Canadian and Australian regulations have improved conditions for investors, according to Justin Schack, a managing director at Rosenblatt Securities, which researches securities markets.

Mr. Schack said It's harder to predict the effect such regulations would have on the more than two dozen dark pool venues that operate in the U.S., though some would likely struggle if forced to better their prices or send trades to exchanges.

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